package com.lzwork.gpt.service;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class CorsFilter implements Filter
{
	@Override
	public void init(FilterConfig filterConfig) throws ServletException
	{
		// nothing to do here
	}

	@Override
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
			throws IOException, ServletException
	{
		HttpServletResponse response = (HttpServletResponse) servletResponse;
		HttpServletRequest request = (HttpServletRequest) servletRequest;

		String origin = request.getHeader("Origin");
		response.setHeader("Access-Control-Allow-Origin", origin);
		response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
		response.setHeader("Access-Control-Max-Age", "3600");
		response.setHeader("Access-Control-Allow-Headers", "content-type, x-requested-with, origin, accept");
		response.setHeader("Access-Control-Allow-Credentials", "true");
		String method = request.getMethod();
		if (method.equalsIgnoreCase("OPTIONS"))
		{
			servletResponse.getOutputStream().write("Success".getBytes("utf-8"));
		} else
		{
			filterChain.doFilter(servletRequest, servletResponse);
		}
	}

	@Override
	public void destroy()
	{
		// nothing to do here
	}
}